Question

List the main functions of the circulating blood.

Answer 1

1. Transport of Oxygen and Carbondioxide :
Blood transports oxygen from the respiratory surface i.e. lungs, buccal cavity to body tissues and carbon dioxide from tissue to respiratory surface.
2. Transport of food :
Blood transports digested food to different cells of the body.
3. Transport of waste products :
Blood transports the waste products of cells and organs to the kidneys, lungs, skin and intestine, so that they may be eliminated.
4. Chemical coordination :
Hormones produced by endocrine glands are distributed to the vital tissues by the blood.
5. Defence against infection :
When bacteria or any other disease causing pathogen enters the body. It is distroyed by WBCs (one type of WBCs; called lymphocytes produce Antibodies against specific pathogen) and so immunity against the disease is created in the body.
6. Clotting of blood :
To prevent excess bleeding, blood-platelets and some protein form clot so as to prevent further bleeding.
7. Water balance :
Blood maintains body temperature constant and distributes and exchanges water between cytoplasm of cells.
8. Temperature regulation :
Heat produced by deeper tissues is taken to the body surface, so that it may be given out and thus body temperature is maintained.
9. Maintainance of body pH :
In RBC, some carbon dioxide combines with water to form carbonic acid (H CO ) that is disossociated into H and HCO . These ions combines with ions of plasma to maintain a constant pH.
10. Maintenance of pressure :
Arteries produce a proper pressure of blood that helps to balance the atmospheric pressure.
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